Silicone carbonate polymers as release layers for pressure sensitive adhesive containing articles

ABSTRACT

The disclosure relates to articles comprising a substrate, a pressure sensitive adhesive, and a release layer, wherein the release layer comprises at least one silicone carbonate polymer.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/550,850, filed Aug. 14, 2017, now allowed, which is a national stagefiling under 35 U.S.C. 371 of PCT/US2016/015265, filed Jan. 28, 2016,which claims the benefit of U.S. Provisional Application No. 62/118,932,filed Feb. 20, 2015, the disclosures of which are incorporated byreference in their entirety herein.

TECHNICAL FIELD

The present disclosure relates to articles having at least one pressuresensitive adhesive and a release layer containing at least one siliconecarbonate polymer.

BACKGROUND

Pressure sensitive adhesives are known to be useful as components ofarticles, such as tapes. In use, many such articles require that thepressure sensitive adhesive be released from contact with anothercomponent of the article. Such release can be facilitated by the use ofa release layer. In tapes, release layers are sometimes known as lowadhesion backsizes.

Some materials that are useful as release layers or low adhesionbacksizes are known in the art and are disclosed in, for example, US2014/0138025 (Bartusiak). Silicone carbonate polymers are not among theknown release layers or low adhesion backsizes.

Silicone carbonate polymers and some uses thereof are disclosed in, forexample US 2008/02742804 (Dhara) U.S. Pat. No. 5,530,083 (Phelps) US2012/0288654 (Gallucci), US 2013/0261234 (MA), JP 2005074100 (Masahiko),U.S. Pat. No. 7,358,305 (Rajagopalan), US 2010/0076544 (Hoffmann), U.S.Pat. No. 590,664 (Battaglia), U.S. Pat. No. 5,703,359 (Wampler, III), WO2013100494 (Kim), US 2011/0201038 (Yu), U.S. Pat. No. 8,541,151 (Yu),and US 2014/0179843 (van der Mee). None of these disclosures envisionthe use of silicone carbonate polymers as release layers for pressuresensitive adhesive containing articles.

SUMMARY

An article can comprise a substrate having a first major surface and asecond major surface, a pressure sensitive adhesive disposed on thefirst major surface, and a release layer comprising a silicone carbonatepolymer disposed on the second major surface. One or both of the firstand second major surfaces can optionally comprise a primer layer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a profile view of an article as described herein.

FIG. 2 is a profile view of another article as described herein.

FIG. 3 is a profile view of still another article as described herein.

FIG. 4 is a profile view of yet another article as described herein.

FIG. 5 is a view of an article as described herein in the form of awound tape with a roller and cutting element.

DETAILED DESCRIPTION

Throughout this disclosure, singular forms such as “a,” “an,” and “the”are often used for convenience; however, it should be understood thatthe singular forms are meant to include the plural unless the singularalone is explicitly specified or is clearly indicated by the context.

Some terms used in this application have special meanings, as definedherein. All other terms will be known to the skilled artisan, and are tobe afforded the meaning that a person of skill in the art at the time ofthe invention would have given them.

“Independently,” when used in reference to the identity of one or morevariable elements, means that each occurrence of any of the variableelements may have the same or different identity, within the specifiedlimitations, regardless of the identity of any other occurrence of thereference element. Thus, if there are two occurrences of element “E,”and element E can be independently selected from identity A or identityB, each of the two occurances of E can be either Y or Z, in anycombination (e.g., YY, YZ, ZY, or ZZ).

A “(meth)acrylic polymer” refers to a polymer comprising a polymerizedform of at least one of methacrylic acid, a methacrylic acid ester,acrylic acid, an acrylic acid ester, or acrylonitrile. Many(meth)acrylic polymers contain polymerized forms of one or more ofmethacrylic acid, a methacrylic acid ester, acrylic acid, an acrylicacid ester, or acrylonitrile and do not contain any other polymerizedmonomers. When the (meth)acrylic polymer contains one or more of amethacrylic acid ester or an acrylic acid ester, the ester can be anyester but is typically an alkyl ester, and most often a C₁ to C₈ alkylester, such as a methyl ester, butyl ester, 2-ethylhexyl ester, or1-methylheptyl ester.

“Alkyl” refers to an aliphatic hydrocarbon radical. Many alkyl groupsare from C₁ to C₃₀. Some alkyl groups can be C₁ or greater, such as C₂or greater, C₄ or greater, C₆ or greater, or C₈ or greater. Some alkylgroups can be C₂₂ or smaller, C₁₆ or smaller, C₁₂ or smaller, C₈ orsmaller, or C₄ or smaller. Unless otherwise indicated, any alkyl groupcan independently be linear, branched, cyclic, or a combination thereof(e.g., a cyclic alkyl can also have a linear or branched component.)Exemplary alkyl groups include methyl, ethyl, propyl, isopropyl,n-butyl, t-butyl, sec-butyl, iso-butyl, 2-ethyl hexyl, iso-octyl,dodecyl, hexadecyl, behenyl, and the like.

A “hydrocarbon diradical” is a diradical that contains only hydrogen andcarbon atoms. Hydrocarbon diradicals can be aliphatic, saturated, orunsaturated; if unsaturated, they can contain one or more aromaticgroups.

An “aromatic diradical” is a diradical that contains at least onearomatic group. Many aromatic diradicals contain two aromatic groups.Typical aromatic groups are phenyl groups, particularly phenyl radicals.Aromatic diradicals can also contain other moieties that are notaromatic.

An “aromatic hydrocarbon diradical” is a hydrocarbon diradical thatcontains at least one aromatic group or aromatic radial. Aromatichydrocarbon diradicals can also contain other hydrocarbon groups orradicals.

A “cellulosic material” is a material that contains at least 5%cellulose by weight. For the purpose of determining whether a materialis a cellulosic material, the cellulose content of syntheticcellulose-containing polymers, such as cellulose acetate, is notconsidered to be cellulose

A “non-cellulosic material” is a material is not a cellulosic material.

“(Meth)acrylate” and its plural refers to one more of acrylic acid,methacrylic acid, acrylic acid esters, methacrylic acid esters, andacrylonitrile.

A “(meth)acrylic polymer” or its plural refers to a polymer or polymerscomprising one more of acrylic acid, methacrylic acid, acrylic acidesters, methacrylic acid esters, and acrylonitrile.

A “silicone carbonate polymer” refers to a polymer having at least onesilicone portion and at least one carbonate portion. Many siliconecarbonate polymers have only one or more silicone portions and one ormore carbonate portions. The silicone portion is often adiorganosiloxane. An exemplary diorganosiloxane is polydimethylsiloxane.The carbonate portion is often based on a bisphenol, most commonlybisphenol A.

Pressure sensitive adhesive containing articles, such as tapes, areoften packaged such that the pressure sensitive adhesive is in contactwith another portion of the article. For example, when the article is atape, the tape is typically wound such that the pressure sensitiveadhesive is in contact with the tape backing. In order to facilitateeasy removal of the pressure sensitive adhesive without significantdetrimental effect, the substrate can have a release layer disposedthereon.

An article can comprise a substrate having a first major surface and asecond major surface. Any suitable substrate can be used. Manysubstrates are moldable thermoplastics. Most substrates are not foamedand are not porous.

Cellulosic substrates are useful for many applications, and are commonlyused for tapes. Common cellulosic substrates include cellulose, paper,regenerated cellulose, wood fibers, and wood flour.

In many cases, the substrate is extrudable. Exemplary extrudablematerials include homopolymers, copolymers, and blends of polymers. Avariety of additives, such as additives that facilitate extrusion,pigments, dyes, and the like, can be added. Suitable polymers include,but are not limited to, polyolefins such as polypropylene orpolyethylene; polystyrene, polycarbonate, polymethyl methacrylate,ethylene vinyl acetate copolymers, acrylate-modified ethylene vinylacetate polymers, ethylene acrylic acid copolymers, nylon,polyvinylchloride, polyimide, and engineering polymers such aspolyketones or polymethylpentanes. Mixtures of such polymers may also beused. In many cases, the substrate does not contain anyvinyl-chloride-based polymers.

The substrate can contain a polyolefinic material, which is typicallymade up of at least 80 wt. % polyolefinic material, including anyhomopolymers, copolymers, blends, etc. thereof (not including the weightof any additives, if such are present). The substrate often comprises atleast 90 wt. %, at least 95 wt. %, or at least 98 wt. %, polyolefinicmaterial. In some cases, the substrate consists essentially ofpolyolefinic material, noting that this does not preclude the presenceof additives such as extrusion aids, plasticizers, antioxidants,colorants, pigments, and the like, which can contain some small level ofnon-polyolefinic material.

Among other things, the polyolefinic material can be a polyethylenicmaterial, meaning that the polyolefinic material contains at least 80wt. % of polyethylene polymers (not including the weight of anyadditives, if present). The polyolefinic material can contain at least90 wt. %, at least 95 wt. %, or at least 98 wt. % of polyethylenepolymers, which are polymers that contain of at least 95 wt. % ethyleneunits. In many cases, the polyethylene polymers are polyethylenehomopolymers. The substrate can consist essentially of polyethylenehomopolymers, which does not preclude the presence of additives, such asthose discussed above, which may contain some small level ofnon-polyethylene polymers.

Suitable polyethylene homopolymers include, for example, high-densitypolyethylene, medium-density polyethylene, low-density polyethylene,linear low-density polyethylene, ultra-low-density polyethylene, and thelike. For some applications, polyethylene homopolymers consistessentially of a blend of low density polyethylene (LDPE, i.e. having adensity of less than 0.93 g/cc) and high density polyethylene (HDPE,i.e. having a density of at least 0.94 g/cc). For some applications, theLDPE has a density of 0.92 g/cc or less. For some applications, the HDPEhas a density of 0.96 or greater.

The LDPE and HDPE can be present at any suitable weight ratio. Forexample, the LDPE and HDPE may be present at a weight ratio of fromabout 10:90 LDPE:HDPE to about 90:10 LDPE:HDPE. In some cases, theweight ratio of LDPE to HDPE may be at most about 45:55, at most about40:60, at most about 35:75, or at most about 30:70. In other casesembodiments, the weight ratio of LDPE to HDPE may be at least about15:85, at least about 20:80, or at least about 25:75.

For some applications, the substrate comprises polyethyleneterephthalate. Such substrates can contain at least 75 wt. %, 80 wt. %,85 wt. %, 90 wt. %, or 95 wt. % of polyethylene terephthalate based onthe total weight of the substrate (not including any primer layers whichmay be present).

For some applications, the substrate comprises polyimide. Suchsubstrates can contain at least 75 wt. %, 80 wt. %, 85 wt. %, 90 wt. %,or 95 wt. % of polyimide based on the total weight of the substrate (notincluding any primer layers which may be present).

Suitable substrates can include one or more inorganic fillers, such asone or more of calcium carbonate, kaolin, talc, silica, titaniumdioxide, glass fibers, glass bubbles, and the like. Such fillers can bepresent in any suitable amounts, typically from 0.05 wt. % to 20 wt. %based on the total weight of the substrate.

Depending on the application, one or more other additives, such asantioxidents, extrusion aids, plasticizers, pigments, and dyes, can alsobe included. Useful additives are known to the person of ordinary skillin the art, and disclosed in, for example, US 2014/0138025 (Bartusiak)and U.S. Pat. No. 6,632,522 (Hyde).

The first major surface of the substrate, upon which the pressuresensitive adhesive is disposed, can optionally include a first primerlayer. The first primer layer, when present, enhances bonding of thepressure sensitive adhesive to the first major surface of the substrate.Suitable first primer layers include chlorinated polyolefins,polyamides, modified acrylic polymers, and modified polymers, such asthose disclosed in U.S. Pat. No. 5,677,376 (Groves), WO 199815601(Groves), and WO 1999003907 (Groves). The first primer layer can also bea plasma primer layer, whereby a plasma, such as oxygen or nitrogen, isapplied to the surface in order to change the surface chemistry byeither oxidizing or reducing the surface.

The second major surface of the substrate, upon which the release layeris disposed, can optionally include a second primer layer. The secondprimer layer, when present, enhances bonding of the release layer to thesecond major surface. Suitable second primer layers include chlorinatedpolyolefins, polyamides, modified acrylic polymers, and modifiedpolymers, such as those disclosed in U.S. Pat. No. 5,677,376 (Groves),WO 199815601 (Groves), and WO 1999003907 (Groves). The second primerlayer can also be a plasma primer layer, whereby a plasma, such asoxygen or nitrogen, is applied to the surface in order to change thesurface chemistry by either oxidizing or reducing the surface.

When used, the first primer layer, second primer layer, or both, can beaffixed to the substrate material by any suitable method. Solventcoating is common. Typically, the content of the first or second primerlayer is dispersed into a solvent at an appropriate concentration, whichis often no greater than 5% solids. The solvent is then coated onto thesubstrate material followed by drying at ambient temperature or elevatedtemperature to produce a thin film of first primer layer, second primerlayer, or both. Any solvent suitable for solvent coating can be used.Example solvents can include one or more of water, heptane, hexanes,toluene, acetone, ethyl acetate, isopropanol, and the like. Mixtures ofmore than one solvent can also be used. Another suitable method isexposure to plasma to form a plasma primer layer as discussed herein.

When the first primer layer, second primer layer, or both, is a plasmaprimer layer, the plasma primer layer can be created by treating thesubstrate with plasma, as discussed herein.

One or more pressure sensitive adhesives are disposed on the first majorsurface of the substrate. Any suitable pressure sensitive adhesive canbe used. Pressure sensitive adhesives are normally tacky at roomtemperature and can be adhered to a surface by application of lightfinger pressure. Thus, pressure sensitive adhesives can be distinguishedfrom other types of adhesives that are not pressure sensitive. A generaldescription of pressure sensitive adhesives can be found in theEncyclopedia of Polymer Science and Engineering, Vol. 13,Wiley-Interscience Publishers (New York, 1988). Additional descriptionof pressure sensitive adhesives can be found in the Encyclopedia ofPolymer Science and Technology, Vol. 1, Interscience Publishers (NewYork, 1964). Any suitable composition, material or ingredient can beused in the one or more pressure sensitive adhesives. Some suitablepressure sensitive adhesive compositions are disclosed in US2003/0215628 (Ma). Typically, pressure sensitive adhesives include oneor more elastomeric polymers, optionally in combination with one or moretackifying resins.

Elastomeric polymers that are useful in the one or more pressuresensitive adhesives include one or more (meth)acrylic polymers, naturalor synthetic rubbers, block copolymers (typically of (meth)acrylates),silicones, and the like. Suitable materials include, without limitation,polyvinyl ethers, polyisoprenes, butyl rubbers, polyisobutylenes,polychloroprenes, butadiene-acrylonitrile polymers, styrene-isoprene,styrene-butylene, and styrene-isoprene-styrene block copolymers,ethylene-propylene-diene polymers, styrene-butadiene polymers, styrenepolymers, poly-alpha-olefins, amorphous polyolefins, polysiloxanes,ethylene vinyl acetates, polyurethanes, silicone-urea polymers,silicone-urethane polymers, polyvinylpyrrolidones, and any combinationthereof.

Examples of suitable (meth)acrylic polymers include polymers made fromthe polymerization of one or more (meth)acrylates. Commonly used(meth)acrylates include methyl methacrylate, ethyl methacrylate, n-butylmethacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate,iso-octyl acrylate, iso-nonyl acrylate, 2-ethyl-hexyl acrylate, decylacrylate, dodecyl acrylate, n-butyl acrylate, hexyl acrylate, octadecylacrylate, octadecyl methacrylate, acrylic acid, methacrylic acid,acrylonitrile, and combinations thereof. Examples of suitablecommercially available block copolymers include those available underthe trade designation KRATON from Kraton Polymers, Houston, Tex. Any ofthese or other suitable materials may be used in any combination,depending on the performance requirements of the final material.

One or more tackifiers can be used as components of the one or morepressure sensitive adhesives. Suitable tackifiers include wood rosins,hydrogenated rosins, tall oil rosins, terpene resins, phenolic resins,polyaromatics, petroleum-based resins, such as aliphatic C5olefin-derived resins, and the like. Those of ordinary skill in the artrecognize that a variety of tackifiers are available, and the specificchoice of whether to use one or more tackifiers, and which one or moretackifiers to use, will depend on the performance requirements of thefinal product. The one or more tackifiers are not required and are notused in all cases. For example, some pressure sensitive adhesives, suchas those which include elastomers that are self-tacky, are often usedwithout added tackifier.

The one or more pressure sensitive adhesives can also contain additivessuch as plasticizers, fillers, antioxidants, stabilizers, pigments, andthe like. Such additives are well known the person of ordinary skill inthe art, and are disclosed, for example, in U.S. Pat. No. 6,632,522(Hyde).

A variety of suitable substrates with suitable pressure sensitiveadhesives disposed on a first major surface thereof are availablecommercially. Examples are available under the trade designations SCOTCHHIGH PERFOMANCE BOX SEALING TAPE 373 and 3M 850 CLEAR POLYESTER FILMTAPE, both available from 3M Company, St. Paul, Minn., USA.

The substrate has a second major surface that is distinct from the firstmajor surface. A release layer comprising at least one siliconecarbonate polymer is disposed on the second major surface. Any suitablesilicone carbonate polymer or polymers can be used. Typical siliconecarbonate polymers have at least one silicone portion having thestructure of Formula (I).

wherein each R is independently an organic moiety and n is the degree ofpolymerization of the silicone portion, which is no less than 1. Atleast one R is typically alkyl. In many cases, each R is alkyl. Thealkyl can be, for example, C₁ to C₂₂ alkyl, C₁ to C₁₆ alkyl, C₁ to C₂₈alkyl, or, most commonly, C₁ to C₂₄ alkyl. Methyl is most common. Inmany cases, each R is methyl, in which case the at least one siliconeportion is polydimethylsiloxane. In most cases, every silicone portionin the silicone carbonate polymer is polydimethylsiloxane, although thisis not required unless otherwise specified.

The degree of polymerization, n, can be any suitable degree ofpolymerization. In some case, n is no less than 1, 5, 10, 20, 25, 30,40, 50, 60, 70, 75, 80, 90, 100, 125, 150, 175, 200, 250, 300, 400, 500,600, 700, 750, 800, 900, 1,000, 1,250, 1,500, 1,750, 2,000, 2,250,2,500, 2,750, 3,000, or 3,250. The degree of polymerization n can, insome cases, be no greater than 3,500, 3,250, 3,000, 2,750, 2,500, 2,250,2,000, 1,750, 1,500, 1,250, 1,000, 900, 8,00, 750, 600, 500, 400, 300,250, 200, 175, 150, 125, 100, 90, 80, 75, 70, 60, 50, 40, 30, 25, or 20.

The silicone carbonate copolymer also contains at least one carbonateportion. Typical carbonate portions have the structure of Formula (II).

In Formula (II), R′ is independently a hydrocarbon diradical or anaromatic diradical. When a hydrocarbon diradical is used, it can be anyhydrocarbon diradical but is often an aromatic diradical. The aromaticdiradical can be any aromatic diradical, such as C₁ to C₅₀ aromaticdiradical or C₁ to C₃₀ aromatic diradical. In some cases, the aromaticdiradical can comprise one or more phenyl groups, phenyl radicals, orphenylene diradicals.

In Formula (II), m is the degree of polymerization of the carbonateportion. The value of m can represent any suitable degree ofpolymerization. In some cases, m is no less than 1, 5, 10, 20, 25, 30,40, 50, 60, 70, 75, 80, 90, 100, 125, 150, 175, 200, 225, 250, 275, 300,325, 350, 375, 400, 425, 450, 475, 500, 550, 600, 700, 750, 1,000,1,000, 1,250, 1,400, 1,500, 1,750, 1,900, or 2,000. In some cases, m isno greater than 2,500, 2,250, 2,000, 1,750 1,500, 1,250, 1,000, 750,700, 600, 550, 500, 475, 425, 400, 375, 350, 325, 300, 275, 250, 225,200, 175, 150, 125, 100, 90, 80, 75, 70, 60, 50, 40, 30, 25, 20, or 10.

Many carbonate portions are based on bisphenols. When such carbonateportions are used, each R′ is typically independently selected from oneor more diradicals of Formulas (III), (IV), (V), (VI), or (VI).

In diradicals of Formulas (III) to (VI), either:

R¹ is H, C₁ to C₄ alkyl, C₁ to C₄ fluoroalkyl, C₁ to C₄ perfluoroalkyl,or phenyl, and

R² is H, C₁ to C₄ alkyl, C₁ to C₄ fluoroalkyl, C₁ to C₄ perfluoroalkyl,or phenyl; or

R¹ and R² are covalently bonded to one another to make, together withthe carbon atom to which they are attached, cyclohexyl, methylcyclohexyl, dimethyl cyclohexyl, trimethyl cyclohexyl, or tetramethylcyclohexyl;

R³ is C₁ to C₄ alkyl, phenyl, or H; and

R⁴ is C₁ to C₄ alkyl, phenyl, or H.

When such bisphenol-based carbonate portions are used, R′ is mostcommonly a diradical of one or more of Formulas (VII) to (XXII)

In many cases, the at least one carbonate portion is based on bisphenolA, in which case R′ is a diradical of Formula (VII).

Useful silicone carbonate polymers can have any suitable molecularweight. Typically, the number average molecular weight of the siliconecarbonate copolymer (measured in Daltons) is no less than 10,000,12,500, 15,000, 16,000, 17,500, 18,000, 19,000, 20,000, 25,000, 30,000,40,000, 50,000, 60,000, 70,000, 75,000, 80,000, 90,000, 100,000,110,000, 120,000, 125,000, 130,000, 140,000, 150,000, 160,000, 170,000,175,000, or 200,000. The number average molecular weight of the siliconecarbonate (measured in Daltons) can be no greater than 250,000, 200,000,175,000, 170,000, 160,000, 150,000, 140,000, 130,000, 125,000, 120,000,110,000, 100,000, 90,000, 80,000, 75,000, 70,000, 60,000, 50,000,40,000, 30,000, 25,000, 20,000, 19,000, 18,000, 17,500, 16,000, 15,000,or 12,500. The number average molecular weight is commonly from 30,000to 150,000 Daltons.

Silicone carbonate polymers can have any suitable silicone content.Typically, the silicone content of the silicone carbonate polymers is noless than 0.5%, 1%, 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, 20%, 22.5%,25%, 27.5%, 30%, 32.5%, 35%, 37.5%, 40%, 42.5%, 45%, 47.5%, 50%, 52.5%,55%, 57.5%, or 60% by weight, based on the total weight of the siliconecarbonate polymer. Often, the silicone content of the silicone carbonatepolymers is no greater than 65%, 62.5%, 60%, 57.75%, 55%, 52.5%, 50%,52.5%, 50%, 47.5%, 45%, 42.5%, 40%, 37.5%, 35%, 32.5%, 30%, 27.5%, 25%,22.5%, 20%, 17.5%, 15%, 12.5%, 10%, 7.5%, 5%, 2.5%, or 1% by weight,based on the total weight of the silicone carbonate polymer.

A variety of suitable silicone carbonate polymers are commerciallyavailable. Examples of commercially available silicone carbonatepolymers include those sold under the trade designations SSP-080(Gelest, Inc., Morrisville, Pa., USA), and LEXAN EXL 1414T (SABIC,Riyadh, Saudi Arabia).

The release layer can be made completely of the at least one siliconecarbonate polymer. Alternatively, the release layer can also include oneor more other materials such as those that are known to be useful asrelease layers or low adhesion backsizes. Some other materials that canbe included are (meth)acrylic polymers, urethane polymers, vinyl esterpolymers, vinyl carbamate polymers, fluorine-containing polymers, andsilicone-containing polymers.

When one or more additional materials are used in addition to the one ormore silicone carbonate polymers in the release layer, the one or moresilicone carbonate polymer can be present in any suitable amount. Forexample the silicone carbonate polymer can be present in greater than1%, 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, 20%, 22.5%, 25%, 27.5%, 30%,32.5%, 35%, 37.5%, 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5%, 60%,62.5%, 65%, 67.5%, 70%, 72.5%, 75%, 77.5%, 80%, 82.5%, 85%, 87.5%, 90%,92.5%, 95%, or 97.5% by weight based on the weight of the release layer.The one or more silicone carbonate polymers can also be present in lessthan 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, 20%, 22.5%, 25%, 27.5%,30%, 32.5%, 35%, 37.5%, 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5%,60%, 62.5%, 65%, 67.5%, 70%, 72.5%, 75%, 77.5%, 80%, 82.5%, 85%, 87.5%,90%, 92.5%, 95%, 97.5%, or 99% by weight based on the weight of therelease layer.

The release layer is typically applied by solvent casting, although thisis not required unless otherwise specified. In a solvent casting method,the silicone carbonate polymer, along with the other materials that makeup the release layer, if any, are dissolved or dispersed in a suitableliquid, which is then applied to the second major surface of thesubstrate. Suitable liquids include those that are capable of dissolvingof dispersing the components of the release layer yet do notunacceptably disrupt the second major surface of the substrate,including any primer layer, upon application to the substrate. Thus, thesuitable liquids selected will depend on the nature of the release layerand the substrate, and will typically be selected, when possible, toprovide a solution, homogeneous dispersion, or nearly homogeneousdispersion of the materials to be coated without adversely affecting thesubstrate, including any primer layer that may be a part of the secondmajor surface of the substrate. Examples of suitable liquids includeN-methyl pyrrolidone, chlorobenzene, methylene chloride, dimethylformamide, dimethyl sulfoxide, and the like. Mixtures of one or more ofthe foregoing, or mixtures of one or more of the foregoing with one ormore alcohols, such as methanol, ethanol, or isopropanol, can also beused.

The solution or dispersion can be at any appropriate concentration.Appropriate concentrations, measured in % solids, are often, but notalways, greater than 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 4%, 5%, 6%, 7%, 8%,or 9%. Appropriate concentrations can be, without limitation, less than10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2.5%, 2%, 1.5%, or 1%.

After the solution or dispersion is applied to the second major surfaceof the substrate, it is dried. Drying can take place at ambienttemperature or at elevated temperatures, depending on, for example, thevolatility of the liquid that is used.

Articles as described herein can be in many different forms, but ofteninclude a tape. When the article includes a tape, the article canfurther comprise a roller such that the tape is wound around the roller.In this configuration, the pressure sensitive adhesive is typically incontact with the release layer in order to facilitate easy unwinding ofthe wound tape.

Depending on the desired application, tapes can be hand-tearable suchthat they can easily be torn off a roll of tape by hand without the needfor scissors, a knife, or another cutting device. Other tapes are nothand-tearable. When such tapes are used, it is often convenient toinclude a cutting element in the article. The cutting element canfacilitate cutting the tape off the roll and into smaller pieces.Rollers and cutting elements for use with tapes are known in the art,and can be selected by a person of ordinary skill depending on thedimensions of the tape, the desired application, and other factors knownin the art. A dispenser for the tape can also be included as part of thearticle. Any type of dispenser can be used, depending on theapplication. The dispenser can include one or more of a roller, cuttingedge, dust cover, and the like.

The Figures depict particular arrangements of articles described herein.FIG. 1 shows article 1000 comprising substrate 1100. Substrate 1100,which can be any substrate, for example those described herein,comprises first major surface 1110 and second major surface 1120.

Pressure sensitive adhesive 1200 is disposed on first major surface1100. Pressure sensitive adhesive 1200 can be any pressure sensitiveadhesive, for example those described herein.

Release layer 1300 is disposed on second major surface 1120. Releaselayer 1300 can be any release layer, for example those described herein,and can contain any silicone carbonate polymer, such as any of thosedescribed herein.

FIG. 2 shows article 2000, which includes substrate 2100, which can beany substrate, for example those described herein, having first majorsurface 2110 and second major surface 2120. First major surface 2110includes primer layer 2111, which can be any primer layer, for examplethose described herein. In FIG. 2, there is no primer layer on secondmajor surface 2120.

Pressure sensitive adhesive 2200 is disposed on first major surface 2110so as to contact primer layer 2111. Pressure sensitive adhesive 2200 canbe any pressure sensitive adhesive, such as those described herein.

Release layer 2300 is disposed on second major surface 2120. Releaselayer 2300 can be any release layer, such as those described herein, andcan contain any silicone carbonate polymer, such as any of thosedescribed herein.

FIG. 3 shows article 3000, which includes substrate 3100, which can beany substrate, for example those described herein, having first majorsurface 3110 and second major surface 3120. Second major surface 3120includes primer layer 3121, which can be any primer layer, for examplethose described herein. In FIG. 3, there is no primer layer on firstmajor surface 3110.

Pressure sensitive adhesive 3200 is disposed on first major surface3110. Pressure sensitive adhesive 3200 can be any pressure sensitiveadhesive, such as those described herein.

Release layer 3300 is disposed on second major surface 3120 so as tocontact primer layer 3121. Release layer 3300 can be any release layer,such as those described herein, and can contain any silicone carbonatepolymer, such as any of those described herein.

FIG. 4 shows article 4000, which includes substrate 4100, which can beany substrate, for example those described herein, having first majorsurface 4110 and second major surface 4120. First major surface 4110includes first primer layer 4111, and second major surface 4120 includessecond primer layer 4121.

Pressure sensitive adhesive 4200 is disposed on first major surface 4110so as to contact first primer layer 4111. Pressure sensitive adhesive4200 can be any pressure sensitive adhesive, such as those describedherein.

Release layer 4300 is disposed on second major surface 4120 so as tocontact second primer layer 4121. Release layer 4300 can be any releaselayer, such as those described herein, and can contain any siliconecarbonate polymer, such as any of those described herein.

FIG. 5 depicts an article 10 comprising tape 5000. Tape 5000 comprisessubstrate 5100, which can be any substrate, for example those describedherein, having first major surface 5110 and second major surface 5120.First major surface 5110 includes first primer layer 5111, which can beany primer layer such as those discussed herein. Second major surface5120 includes second primer layer 5121, which can be any primer layersuch as those discussed herein.

Pressure sensitive adhesive 5200 is disposed on first major surface 5110so as to contact first primer layer 5111. Pressure sensitive adhesive5200 can be any pressure sensitive adhesive, such as those describedherein.

Release layer 5300 is disposed on second major surface 5210 so as tocontact second primer layer 5211. Release layer 5300 can be any releaselayer, such as those described herein, and can contain any siliconecarbonate polymer, such as any of those described herein.

The article 10 also includes roller 20 and dispenser 30. Tape 5000 iswound around roller 20 such that pressure sensitive adhesive 5200releasably contacts release layer 5300. In this configuration, a usercan easily unwind and use tape 5000. Article 10 also includes cuttingelement 40 to facilitate cutting tape 5000 into desired lengths. In FIG.5, cutting element 40 is attached to roller 20, but this is not requiredsince other configurations of these elements are known to people ofordinary skill in the tape art.

List of Illustrative Embodiments

The following embodiments are enumerated in order to assist a person ofskill in the art in understanding various aspects of the disclosure.Because these enumerated embodiments are for illustrative purposes, theyare not intended to be limiting.

1. An article comprising

a substrate having at least a first major surface and a second majorsurface;

a pressure sensitive adhesive disposed on the first major surface; and

a release layer comprising a silicone carbonate polymer disposed on thesecond major surface.

2. The article of embodiment 1, wherein the substrate is a tape backing.3. The article of any one of the preceding embodiments, wherein thesubstrate comprises at least one cellulosic material.4. The article of embodiment 3, wherein the at least one cellulosicmaterial comprises at least one of cellulose, paper, regeneratedcellulose, wood fibers, and wood flour.5. The article of any of embodiments 1 or 2, wherein the substratecomprises at least one non-cellulosic material.6. The article of embodiment 5, wherein the non-cellulosic materialcomprises at least one of cellulose acetate and cellulose acetatephthalate.7. The article of embodiment 5, wherein the non-cellulosic materialcomprises at least one polyolefin.8. The article of embodiment 7, wherein the at least one polyolefincomprises polyethylene, polypropylene, or a combination thereof.9. The article of embodiment 8, wherein the at least one polyolefincomprises polyethylene.10. The article of embodiment 5, wherein the non-cellulosic materialcomprises at least one polyimide.11. The article of embodiment 5, wherein the non-cellulosic materialcomprises at least one of poly methyl methacrylate, ethylene vinylacetate copolymer, acrylate-modified ethylene vinyl acetate copolymer,ethyl acrylic acid copolymer, nylon, polyvinylchloride, polyethyleneterephthalate, polyketones, and polymethylpentanes.12. The article of embodiment 11, wherein the non-cellulosic materialcomprises at least one of polymethyl methacrylate, ethylene vinylacetate copolymer, acrylate-modified ethylene vinyl acetate copolymer,ethyl acrylic acid copolymer, polyethylene terephthalate and nylon.13. The article of embodiment 12, wherein the non-cellulosic materialcomprises polyethylene terephthalate.14. The article of any of the preceding embodiments wherein the pressuresensitive adhesive comprises at least one of (meth)acrylic polymers,natural rubbers, synthetic rubbers, and silicone elastomers.15. The article of embodiment 14, wherein the pressure sensitiveadhesive comprises a (meth)acrylic polymer.16. The article of embodiment 15, wherein the (meth)acrylic polymercomprises a polymerized form of at least one of methyl methacrylate,ethyl methacrylate, n-butyl methacrylate, methyl acrylate, ethylacrylate, n-butyl acrylate, iso-octyl acrylate, iso-nonyl acrylate,2-ethyl-hexyl acrylate, decyl acrylate, dodecyl acrylate, n-butylacrylate, hexyl acrylate, octadecyl acrylate, octadecyl methacrylate,acrylic acid, methacrylic acid, and acrylonitrile.17. The article of embodiment 14, wherein the pressure sensitiveadhesive comprises at least one of polyvinyl ethers, polyisoprenes,butyl rubbers, polyisobutylenes, polychloroprenes,butadiene-acrylonitrile polymer, styrene-isoprene, styrene-butylene, andstyrene-isoprene-styrene block copolymer, ethylene-propylene-dienepolymers styrene-butadiene polymer, styrene polymer, poly-alpha-olefin,amorphous polyolefin, polysiloxane, ethylene vinyl acetate,polyurethane, silicone-urea polymer, silicone-urethane polymer, andpolyvinylpyrrolidone.18. The article of any of the preceding embodiments, wherein thepressure sensitive adhesive further comprises a tackifier.19. The article of embodiment 18, wherein the tackifier comprises atleast one of rosin, synthetic hydrocarbon resin, terpene resin, andliquid rubber.20. The article of any of embodiments 18-19, wherein the tackifier ispresent from 0.1 wt. % to 95 wt. % based on the weight of the pressuresensitive adhesive.21. The article of embodiment 20, wherein the tackifier is present from1 wt. % to 95 wt. % based on the weight of the pressure sensitiveadhesive22. The article of embodiment 21, wherein the tackifier is present from20 wt. % to 95 wt. % based on the weight of the pressure sensitiveadhesive.23. The article of embodiment 22, wherein the tackifier is present from50 wt. % to 95 wt. % based on the weight of the pressure sensitiveadhesive.24. The article of embodiment 23, wherein the tackifier is present from80 wt. % to 95 wt. % based on the weight of the pressure sensitiveadhesive.25. The article of any of the preceding embodiments, wherein thesilicone carbonate copolymer comprises at least one silicone portionhaving the structure of Formula (I)

wherein each R is independently an organic moiety and n is the degree ofpolymerization of the silicone portion which is no less than 1.

26. The article of embodiment 25, wherein at least one R is alkyl.27. The article of any of embodiments 25 and 26, wherein each R isindependently alkyl.28. The article of any of embodiments 26 and 27, wherein the alkyl is C₁to C₂₂ alkyl.29. The article of embodiment 28, wherein the alkyl is C₁ to C₁₆ alkyl.30. The article of embodiment 29, wherein the alkyl is C₁ to C₈ alkyl.31. The article of embodiment 30, wherein the alkyl is C₁ to C₄ alkyl.32. The article of embodiment 31, wherein the alkyl is methyl.33. The article of embodiment 25, wherein the at least one siliconeportion is polydimethylsiloxane.34. The article of any of the preceding embodiments, wherein thesilicone carbonate polymer comprises at least one carbonate portionhaving the structure of Formula (II)

wherein each R′ is independently a hydrocarbon diradical or an aromaticdiradical, and m is the degree of polymerization of the carbonateportion which is no less than 1.

35. The article of embodiment 34, wherein at least one aromatichydrocarbon diradical comprises one or more phenyl radicals, one or morephenylene diradicals, or one or more phenyl radicals and one or morephenylene diradicals.36. The article of embodiment 34 or 35, wherein each R′ is independentlyselected from the group consisting of

wherein either:

R1 is H, C1 to C4 alkyl, C1 to C4 fluoroalkyl, C1 to C4 perfluoroalkyl,or phenyl, and

R2 is H H, C1 to C4 alkyl, C1 to C4 fluoroalkyl, C1 to C4perfluoroalkyl, or phenyl; or

R1 and R2 are covalently bonded to one another to make, together withthe carbon atom to which they are attached, cyclohexyl, methylcyclohexyl, dimethyl cyclohexyl, or trimethyl cyclohexyl or tetramethylcyclohexyl;

R3 is C1 to C4 alkyl, phenyl, or H; and

R4 is C1 to C4 alkyl, phenyl, or H.

37. The article of embodiment 36, wherein each R′ is independentlyselected from the group consisting of

38. The article of embodiment 37, wherein each R′ is a diradical ofFormula (VII)

39. The article of any of the preceding embodiments, wherein thesilicone carbonate polymer contains 0.5 wt. % to 60 wt. % silicone basedon the weight of the silicone carbonate polymer.40. The article of any of the preceding embodiments, wherein thesilicone carbonate polymer contains no less than 5 wt. % silicone basedon the weight of the silicone carbonate polymer.41. The article of any of the preceding embodiments, wherein thesilicone carbonate polymer contains no less than 10 wt. % silicone basedon the weight of the silicone carbonate polymer.42. The article of any of the preceding embodiments, wherein thesilicone carbonate polymer contains no more than 50 wt. % silicone basedon the weight of the silicone carbonate polymer.43. The article of any of the preceding embodiments, wherein thesilicone carbonate polymer has a number average molecular weight from10,000 D to 250,000 D.44. The article of embodiment 43, wherein the silicone carbonate polymerhas a number average molecular weight from 20,000 D to 175,000 D.45. The article of embodiment 44, wherein the silicone carbonate polymerhas a number average molecular weight from 40,000 D to 150,000 D.46. The article of any of the preceding embodiments, wherein the releaselayer comprises no less than 1 wt. % of the silicone carbonate polymerbased on the total weight of release layer.47. The article of embodiment 46, wherein the release layer comprises noless than 2.5 wt. % of the silicone carbonate polymer based on the totalweight of release layer.48. The article of embodiment 46, wherein the release layer comprises noless than 5 wt. % of the silicone carbonate polymer based on the totalweight of release layer.49. The article of embodiment 46, wherein the release layer comprises noless than 7.5 wt. % of the silicone carbonate polymer based on the totalweight of release layer.50. The article of embodiment 46, wherein the release layer comprises noless than 10 wt. % of the silicone carbonate polymer based on the totalweight of release layer.51. The article of embodiment 46, wherein the release layer comprises noless than 12.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.52. The article of embodiment 46, wherein the release layer comprises noless than 15 wt. % of the silicone carbonate polymer based on the totalweight of release layer.53. The article of embodiment 46, wherein the release layer comprises noless than 17.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.54. The article of embodiment 46, wherein the release layer comprises noless than 20 wt. % of the silicone carbonate polymer based on the totalweight of release layer.55. The article of embodiment 46, wherein the release layer comprises noless than 22.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.56. The article of embodiment 46, wherein the release layer comprises noless than 25 wt. % of the silicone carbonate polymer based on the totalweight of release layer.57. The article of embodiment 46, wherein the release layer comprises noless than 27.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.58. The article of embodiment 46, wherein the release layer comprises noless than 30 wt. % of the silicone carbonate polymer based on the totalweight of release layer.59. The article of embodiment 46, wherein the release layer comprises noless than 32.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.60. The article of embodiment 46, wherein the release layer comprises noless than 35 wt. % of the silicone carbonate polymer based on the totalweight of release layer.61. The article of embodiment 46, wherein the release layer comprises noless than 37.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.62. The article of embodiment 46, wherein the release layer comprises noless than 40 wt. % of the silicone carbonate polymer based on the totalweight of release layer.63. The article of embodiment 46, wherein the release layer comprises noless than 42.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.64. The article of embodiment 46, wherein the release layer comprises noless than 45 wt. % of the silicone carbonate polymer based on the totalweight of release layer.65. The article of embodiment 46, wherein the release layer comprises noless than 47.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.66. The article of embodiment 46, wherein the release layer comprises noless than 50 wt. % of the silicone carbonate polymer based on the totalweight of release layer.67. The article of embodiment 46, wherein the release layer comprises noless than 52.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.68. The article of embodiment 46, wherein the release layer comprises noless than 55 wt. % of the silicone carbonate polymer based on the totalweight of release layer.69. The article of embodiment 46, wherein the release layer comprises noless than 57.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.70. The article of embodiment 46, wherein the release layer comprises noless than 60 wt. % of the silicone carbonate polymer based on the totalweight of release layer.71. The article of embodiment 46, wherein the release layer comprises noless than 62.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.72. The article of embodiment 46, wherein the release layer comprises noless than 65 wt. % of the silicone carbonate polymer based on the totalweight of release layer.73. The article of embodiment 46, wherein the release layer comprises noless than 67.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.74. The article of embodiment 46, wherein the release layer comprises noless than 70 wt. % of the silicone carbonate polymer based on the totalweight of release layer.75. The article of embodiment 46, wherein the release layer comprises noless than 72.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.76. The article of embodiment 46, wherein the release layer comprises noless than 75 wt. % of the silicone carbonate polymer based on the totalweight of release layer.77. The article of embodiment 46, wherein the release layer comprises noless than 77.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.78. The article of embodiment 46, wherein the release layer comprises noless than 80 wt. % of the silicone carbonate polymer based on the totalweight of release layer.79. The article of embodiment 46, wherein the release layer comprises noless than 82.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.80. The article of embodiment 46, wherein the release layer comprises noless than 85 wt. % of the silicone carbonate polymer based on the totalweight of release layer.81. The article of embodiment 46, wherein the release layer comprises noless than 87.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.82. The article of embodiment 46, wherein the release layer comprises noless than 90 wt. % of the silicone carbonate polymer based on the totalweight of release layer.83. The article of embodiment 46, wherein the release layer comprises noless than 92.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.84. The article of embodiment 46, wherein the release layer comprises noless than 95 wt. % of the silicone carbonate polymer based on the totalweight of release layer.85. The article of embodiment 46, wherein the release layer comprises noless than 97.5 wt. % of the silicone carbonate polymer based on thetotal weight of release layer.86. The article of embodiment 46, wherein the release layer comprises noless than 99 wt. % of the silicone carbonate polymer based on the totalweight of release layer.87. The article of any of the preceding embodiments, wherein the releaselayer consists essentially of the silicone carbonate polymer.88. The article any of the preceding embodiments, wherein the releaselayer comprises no greater than 2.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.89. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 5 wt. % of the silicone carbonate polymerbased on the total weight of release layer.90. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 7.5 wt. % of the silicone carbonate polymerbased on the total weight of release layer.91. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 10 wt. % of the silicone carbonate polymerbased on the total weight of release layer.92. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 12.5 wt. % of the silicone carbonate polymerbased on the total weight of release layer.93. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 15 wt. % of the silicone carbonate polymerbased on the total weight of release layer.94. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 17.5 wt. % of the silicone carbonate polymerbased on the total weight of release layer.95. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 20 wt. % of the silicone carbonate polymerbased on the total weight of release layer.96. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 22.5 wt. % of the silicone carbonate polymerbased on the total weight of release layer.97. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 25 wt. % of the silicone carbonate polymerbased on the total weight of release layer.98. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 27.5 wt. % of the silicone carbonate polymerbased on the total weight of release layer.99. The article of any of embodiments 1 to 87, wherein the release layercomprises no greater than 30 wt. % of the silicone carbonate polymerbased on the total weight of release layer.100. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 32.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.101. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 35 wt. % of the silicone carbonatepolymer based on the total weight of release layer.102. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 37.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.103. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 40 wt. % of the silicone carbonatepolymer based on the total weight of release layer.104. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 42.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.105. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 45 wt. % of the silicone carbonatepolymer based on the total weight of release layer.106. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 47.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.107. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 50 wt. % of the silicone carbonatepolymer based on the total weight of release layer.108. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 52.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.109. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 55 wt. % of the silicone carbonatepolymer based on the total weight of release layer.110. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 57.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.111. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 60 wt. % of the silicone carbonatepolymer based on the total weight of release layer.112. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 62.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.113. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 65 wt. % of the silicone carbonatepolymer based on the total weight of release layer.114. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 67.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.115. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 70 wt. % of the silicone carbonatepolymer based on the total weight of release layer.116. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 72.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.117. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 75 wt. % of the silicone carbonatepolymer based on the total weight of release layer.118. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 77.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.119. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 80 wt. % of the silicone carbonatepolymer based on the total weight of release layer.120. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 82.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.121. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 85 wt. % of the silicone carbonatepolymer based on the total weight of release layer.122. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 87.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.123. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 90 wt. % of the silicone carbonatepolymer based on the total weight of release layer.124. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 92.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.125. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 95 wt. % of the silicone carbonatepolymer based on the total weight of release layer.126. The article of any of embodiments 1 to 87, wherein the releaselayer comprises no greater than 97.5 wt. % of the silicone carbonatepolymer based on the total weight of release layer.127. The article any of embodiments 1 to 87, wherein the release layercomprises no greater than 99 wt. % of the silicone carbonate polymerbased on the total weight of release layer.128. The article of any of the preceding embodiments, wherein the secondmajor surface comprises a primer layer.129. The article of embodiment 128, wherein the primer layer comprisesat least one of chlorinated polyolefin, polyamide, and modified acrylicpolymer.130. The article of any of the preceding embodiment, wherein the articlecomprises a tape.131. The article of embodiment 130, wherein the tape is hand-tearable.132. The article of any of embodiments 130 to 131, wherein the tape iswound.133. The article of any of the preceding embodiments, further comprisinga roller.134. The article of any of the preceding embodiments, wherein thearticle comprises a tape that is wound around a roller.135. The article of any of the preceding embodiments, further comprisinga cutting element.136. The article of any of claims 130-135, wherein the article comprisesa tape dispenser.137. The article of any of the preceding embodiments, wherein thepressure sensitive adhesive is a repositionable adhesive.138. The article of embodiment 137, wherein the article is arepositionable article.

Examples

The invention is further illustrated by the following examples. Theseexamples are for illustrative purposes only and are not meant to belimiting on the scope of the appended claims.

TABLE 1 Materials Designation Description Source LEXAN A polycarbonateSABIC, Riyadh, EXL 1414T polydimethylsiloxane copolymer Saudi Arabiaavailable from SABIC under the trade designation “LEXAN EXL 1414T” NMPN-methylpyrrolidone TCI America, Portland, OR Primed A primed PET(“poly(ethylene Mitsubishi PET Film terephthalate)”) film PolyesterFilm, available from Mitsubishi under Inc., Greer SC the tradedesignation “HOSTAPHAN 0.002 3SAB PRIMED 1S 50 IN” 373 A packaging tape,available 3M Co., TAPE from 3M Co. under the trade St. Paul, MNdesignation “SCOTCH HIGH PERFORMANCE BOX SEALING TAPE 373” 2097 Apainter's tape, available 3M Co., TAPE from 3M Co. under the trade St.Paul, MN designation “SCOTCHBLUE PAINTER'S TAPE EXTERIOR SURFACES 2097”850 A polyester film tape, available 3M Co., TAPE from 3M Co. under thetrade St. Paul, MN designation “3M 850 CLEAR POLYESTER FILM TAPE”

Preparation of LAB-Coated PET Film

A sample of silicone polycarbonate (LEXAN EXL 1414T) was weighed out anddissolved in NMP to obtain a 2.5 wt. % solids solution. The 2.5 wt. %solution was then coated onto a primed PET film using a #6 Meyer rod.The coated PET film was placed onto an open frame particle board, coatedside up, and dried in an oven at 110° C. for 15 minutes to give anLAB-coated PET film.

Preparation of Example Laminated Tape Sample for Peel Force andRe-Adhesion Force Testing

After drying the LAB-coated PET film, various samples of tape (used asreceived) were unwound from their rolls and cut to 1 inch (˜2.5 cm) wideand 6 inches (˜15.2 cm) long. The cut tape samples were then laminatedonto the LAB-coated PET film. A 5 lb. (˜2.3 kg) roller was rolled backand forth across the laminated tape once. For aging, the laminatedsamples were kept between two glass plates, in layers separated with asheet of silicone liner. The laminated samples were aged at varioustime, temperature, and relative humidity conditions, as indicated inTables 3-6.

Preparation of Control Laminated Tape Samples (CE-1 to CE-3) for“Tape-on-Tape” Measurements

As a control, tape-on-tape control samples of the “as received” tapeswere prepared as follows. A first piece of the “as received” tape beingtested was laminated onto PET film (but with no LAB coating). Then asecond piece of the same “as received” tape, cut to 1 inch (˜2.5 cm)wide and 6 inches (˜15.2 cm) long, was laminated on top of the firstpiece of tape. A 5 lb. (˜2.3 kg) roller was rolled back and forth acrossthe laminated tape once. For aging, the laminated samples were keptbetween two glass plates, in layers separated with a sheet of siliconeliner. The laminated samples were aged at various time, temperature, andrelative humidity conditions, as indicated in Tables 3-6.

Test Methods

All peel tests were conducted in a constant temperature and controlledpercent relative humidity (% RH) room (“CTCH room”). The room was setfor 72° F. (˜22° C.) and 50% RH. The summarized test results are theaverage of triplicate samples.

180° Peel Test Method—for Examples

A piece of double sided tape was adhered to a glass plate on a peeltester (SLIP/PEEL TESTER MODEL 3M90, available from Instrumentors Inc.,Strongsville, Ohio). Then the aged tape sample (either an Examplelaminated tape sample or a Control laminated tape sample) was laminatedonto the double sided piece of tape. The aged tape sample was rolledwith a 5 lb. (˜2.3 kg) roller in a forward direction one time. The tapewas then peeled at an angle of 180° with a peel rate of 90 in/min (˜2.3m/min) to yield a peel force value, and the resulting peel force valuewas converted to N/dm.

Re-Adhesion Force Test Method

The tape sample that was peeled in the 180° Peel Test Method wassubsequently laminated onto a glass plate on a peel tester (IMASS MODELTL-2300, available from Instrumentors Inc., Strongsville, Ohio) androlled in one direction with a 5 lb. (˜2.3 kg) roller to provide a“re-adhered” sample. The re-adhered sample was peeled at an angle of180° with a peel rate of 90 in/min (˜2.3 m/min.). The resultingre-adhesion force values were converted to N/dm.

TABLE 2 Tape Samples Sample No. Description EX-1 373 TAPE + siliconecarbonate polymer release layer CE-1 373 TAPE (as received) EX-2 2097TAPE + silicone carbonate polymer release layer CE-2 2097 TAPE (asreceived) EX-3 850 TAPE + silicone carbonate polymer release layer CE-3850 TAPE (as received)

Percent adhesion values were determined by dividing the re-adhesionvalue of the Example laminated tape sample by the re-adhesion valueobtained with the respective control laminated tape sample (tape-on-tapesample), and then multiplying by 100.

Test data for peel force, re-adhesion force, and the calculated percentadhesion values were as summarized in each of Tables 3-6, with the agingconditions indicated in the title of each respective Table.

TABLE 3 Aging conditions: 3 days in CTCH room at 72° F. (~22° C.) 50% RHSample Peel Force, Re-adhesion Force, Percent No. oz/in (N/dm) oz/in(N/dm) Adhesion EX-1 7.3 (8.0) 67.9 (74.0) 127 CE-1 14.6 (16.0) 53.6(58.4) EX-2 7.5 (8.2) 51.9 (56.6) 148 CE-2 16.6 (18.1) 35 (38.2) EX-33.5 (3.8) 44.8 (48.8) 116 CE-3 8.7 (9.5) 38.6 (42.1)

TABLE 4 Aging conditions: 3 days at 65° C., dry oven Sample Peel Force,Re-adhesion Force, Percent No. oz/in (N/dm) oz/in (N/dm) Adhesion EX-19.8 (10.7) 70.4 (76.7) 141 CE-1 38.2 (41.6) 50.1 (54.6) EX-2 10.6 (11.6)46.7 (50.9) 146 CE-2 31.1 (33.9) 32 (34.9) EX-3 11.4 (12.4) 39.9 (43.5)106 CE-3 11.8 (12.9) 37.8 (41.2)

TABLE 5 Aging conditions: 7 days in CTCH room at 90° F. (~32° C.) and90% RH Sample Peel Force, Re-adhesion Force, Percent No. oz/in (N/dm)oz/in (N/dm) Adhesion EX-1 6.4 (7.0) 72.8 (79.4) 143 CE-1 23.1 (25.2)50.8 (55.4) EX-2 7.3 (8.0) 52.2 (56.9) 132 CE-2 25.4 (27.7) 39.4 (42.9)

TABLE 6 Aging conditions: 7 days at 50° C., dry oven Sample Peel Force,Re-adhesion Force, Percent No. oz/in (N/dm) oz/in (N/dm) Adhesion EX-18.1 (8.8) 72.4 (78.9) 143 CE-1 16.6 (18.1) 50.8 (55.4) EX-2 11.6 (12.6)35.1 (38.3) 124 CE-2 9.2 (10.0) 28.4 (31.0) EX-3 20.2 (22.0) 33 (36.0)89 CE-3 8.2 (8.9) 36.9 (40.2)

What is claimed is:
 1. An article comprising a substrate having a firstmajor surface and a second major surface; a pressure sensitive adhesivedisposed on the first major surface; and a release layer comprising asilicone carbonate polymer disposed on the second major surface.
 2. Thearticle of claim 1, wherein one or more of the first major surface andthe second major surface comprises a primer layer.
 3. The article ofclaim 1, wherein the substrate comprises a non-cellulosic material. 4.The article of claim 3, wherein the non-cellulosic material comprises atleast one of polymethyl methacrylate, ethylene vinyl acetate copolymer,acrylate-modified ethylene vinyl acetate copolymer, ethyl acrylic acidcopolymer, polyethylene terephthalate and nylon.
 5. The article of claim4, wherein the non-cellulosic material comprises one or more ofpolyethylene, polypropylene, and polyethylene terephthalate.
 6. Thearticle of claim 4, wherein the substrate comprises polyimide.
 7. Thearticle of claim 1, wherein the silicone carbonate copolymer comprisesat least one silicone portion having the structure of Formula (I)

wherein each R is independently an organic moiety and n is the degree ofpolymerization of the at least one silicone portion, which is no lessthan
 1. 8. The article of claim 7, wherein the at least one siliconeportion comprises polydimethylsiloxane.
 9. The article of claim 1,wherein the silicone carbonate polymer comprises at least one carbonateportion having the structure of Formula (II)

wherein R′ is a hydrocarbon diradical or an aromatic diradical and m isthe degree of polymerization of the at least one carbonate portion,which is no less than
 1. 10. The article of claim 9, wherein R′ isselected from the group consisting of diradicals of Formulas (III) to(VI)

wherein either: R¹ is H, C₁ to C₄ alkyl, C₁ to C₄ fluoroalkyl, C₁ to C₄perfluoroalkyl, or phenyl, and R² is H H, C₁ to C₄ alkyl, C₁ to C₄fluoroalkyl, C₁ to C₄ perfluoroalkyl, or phenyl; or R¹ and R² arecovalently bonded to one another to make, together with the carbon atomto which they are attached, cyclohexyl, methyl cyclohexyl, dimethylcyclohexyl, or trimethyl cyclohexyl or tetramethyl cyclohexyl; R³ is C₁to C₄ alkyl, phenyl, or H; and R⁴ is C₁ to C₄ alkyl, phenyl, or H. 11.The article of claim 10, wherein R′ is selected from the groupconsisting of diradicals of Formulas (VII) to (XXII)


12. The article of claim 11, wherein R′ is the diradical of Formula(VII)


13. The article of claim 1, wherein the article is a tape.
 14. Thearticle of claim 13, further comprising a roller and wherein the tape iswound around a roller.
 15. The article of claim 13, further comprising acutting element.